Pussy Riot KICK OUT Maria Alyokhina and Nadezhda Tolokonnikova From Group

Pussy Riot appear to have turned their backs on their formerly incarcerated members Maria Alyokhina and Nadezhda Tolokonnikova for making an appearance at the Amnesty International Concert in New York this week, claiming they have forgotten the “aspirations and ideals” of the group.

Maria and Nadezhda, also known as Nadia, were given tributes from the likes of Madonna, Imagine Dragons and Blondie at the concert held at Brooklyn's Barclays Center on Wednesday, just weeks after they were freed from a Russian prison for singing a protest song in a Moscow cathedral in 2012.

Maria Alyokhina and Nadezhda Tolokonnikova are no longer Pussy Riot members (Independent-Image/WENN.com)

While some may have hailed the appearance as iconic given their ordeal during their 16-month jail stint, it didn't go down well with the other members of Pussy Riot who have blasted the pair for apparently not sticking by their beliefs.

According to BBC News, the group states that the pair have forgotten the “aspirations and ideals of our group” while adding that they belonged to a “leftist anti-capitalist ideology” and had become “institutionalised advocates of prisoners' rights.”

Madonna at the Amnesty International Concert on Wednesday (Janet Meyer/Splash News)

The letter continued: “Unfortunately for us, they are being so carried away with the problems in Russian prisons, that they completely forgot about the aspirations and ideals of our group - feminism, separatist resistance, fight against authoritarianism and personality cult, all of which, as a matter of fact, was the cause for their unjust punishment."

“Our performances are always 'illegal', staged only in unpredictable locations and public places not designed for traditional entertainment,” the letter read.

Madge introduced the pair on stage (Janet Meyer/Splash News)

The group continued: “Yes, we lost two friends, two ideological fellow member (sic), but the world has acquired two brave, interesting, controversial human rights defenders - fighters for the rights of the Russian prisoners.

“Unfortunately, we cannot congratulate them with this in person, because they refuse to have any contact with us.”